Fraction of absorbed photosynthetically active radiation information
The fraction of absorbed photosynthetically active radiation (FAPAR, sometimes also noted fAPAR or fPAR) is the fraction of the incoming solar radiation in the photosynthetically active radiation spectral region that is absorbed by a photosynthetic organism, typically describing the light absorption across an integrated plant canopy.
This biophysical variable is directly related to the primary productivity of photosynthesis and some models use it to estimate the assimilation of carbon dioxide in vegetation in conjunction with the leaf area index. FAPAR can also be used as an indicator of the state and evolution of the vegetation cover; with this function, it advantageously replaces the Normalized Difference Vegetation Index (NDVI), provided it is itself properly estimated.
FAPAR can be directly measured on the ground, by putting a spectrometer above and below canopy cover. On a larger scale, however, it is estimated from space measurements in the solar spectral range and a number of state of the art algorithms have been proposed to derive this important environmental variable.[1] Currently, there are some remote sensing products of FAPAR, such as AVHRR and MODIS.
FAPAR is one of the 50 Essential Climate Variables recognized by the UN Global Climate Observing System (GCOS) as necessary to characterize the climate of the Earth. GCOS has issued specific recommendations to monitor this variable systematically, both through a reanalysis of existing databases and in the future with current and forthcoming instruments.
^Qin, Haiming; Wang, Cheng; Zhao, Kaiguang; Xi, Xiaohuan (29 May 2018). "Estimation of the fraction of absorbed photosynthetically active radiation (fPAR) in maize canopies using LiDAR data and hyperspectral imagery". PLOS ONE. 13 (5): e0197510. Bibcode:2018PLoSO..1397510Q. doi:10.1371/journal.pone.0197510. PMC 5973554. PMID 29813094.
and 28 Related for: Fraction of absorbed photosynthetically active radiation information
plants absorb solar radiation in the photosyntheticallyactiveradiation (PAR) spectral region, which they use as a source of energy in the process of photosynthesis...
what kind of light is used (see Photosyntheticallyactiveradiation). It takes eight (or perhaps ten or more) photons to use one molecule of CO2. The Gibbs...
Index Weighted Difference Vegetation Index (WDVI) Fractionofabsorbedphotosyntheticallyactiveradiation (FAPAR) Normalised Difference Greenness index (NDGI)...
Organic reaction Photobiology Photoinhibition Photosynthetic reaction center Photosyntheticallyactiveradiation Photosystem Photosystem I Photosystem II Quantasome...
conversion of the absorbed pulsed or modulated radiation into heat energy. temporal changes of the temperatures at the loci where radiation is absorbed – rising...
Fluorescence is one of two kinds of emission of light by a substance that has absorbed light or other electromagnetic radiation. Fluorescence involves...
by the photosynthetic action of living organisms. Another form (allotrope) of oxygen, ozone (O 3), strongly absorbs ultraviolet UVB radiation and the...
pathways 12 C is absorbed slightly more easily than 13 C, which in turn is more easily absorbed than 14 C. The differential uptake of the three carbon...
and thus has a much smaller mass-fraction than in other concepts. For a long-term habitation, however, radiation shielding must rotate with the habitat...
of the Earth", which dramatically changed the composition of life forms on Earth. Cyanobacteria use photosynthetic pigments, such as various forms of...
{\displaystyle f_{i}} , the fractionof life-bearing planets whereon intelligent life appears; f c {\displaystyle f_{c}} , the fractionof civilizations that reach...
fluxes as well as the transfer and cycling of organic matter via biological processes. The photosynthetically fixed carbon is rapidly recycled and reused...
cap. Further research—including a consideration of the amount ofphotosyntheticallyactiveradiation—suggested that tidally locked planets in red dwarf...
In the air, carbon dioxide is transparent to visible light but absorbs infrared radiation, acting as a greenhouse gas. Carbon dioxide is soluble in water...
affected by radiation throughout development are more affected by the inability to intercept light with a larger leaf area than having photosynthetic systems...
cannot process them swiftly enough. Light – Light, also called photosyntheticActiveRadiation (PAR) is the energy source for green plant growth. PAR powers...
ofactive ingredients and lipid content. For example, phenolic antioxidants such as stilbenes, flavonoids, and hydroxycinnamic acid strongly absorb UV...
factors such as radiation can cause DNA damage, resulting in tens of thousands of individual molecular lesions per cell per day. Many of these lesions cause...
Dissolved organic carbon (DOC) is the fractionof organic carbon operationally defined as that which can pass through a filter with a pore size typically...
effect; gaseous constituents of the atmosphere, both natural and from human activity, that absorb and re-emit infrared radiation. Water vapor (H2O) is the...
The absorbance pattern responsible for the red color of anthocyanins may be complementary to that of green chlorophyll in photosyntheticallyactive tissues...
significant fractionof protons of the radiation belts and solar wind did not reach the samples. R3D measured ionizing and non-ionizing radiation as well...
carbon dioxide into oxygen and carbohydrates. Water splitting using solar radiation has not been commercialized. Photocatalytic water splitting is done by...
productivity of the algae also peaked under blue light for both cultures. In another study, UV-A (320 - 400 nm) was added to the photosyntheticallyactive light...
cap. Further research—including a consideration of the amount ofphotosyntheticallyactiveradiation—suggested that tidally locked planets in red dwarf...
initial step of photosynthesis whereby light energy is absorbed by chlorophyll pigments attached to proteins in the thylakoid membranes. The absorbed light energy...